Based on a panel survey filled by seventh grade students, who studied in Shaxi Middle School located in Shaxi, Yunnan, China, after completing a semester of Online English Peer Tutoring Program, the research applied the data collected, including English Exam grades and background information, with Regression and Z-score to analyze the effectiveness of Private Tutoring. The analysis yields the following findings: private tutoring is effective for all students regardless of natural abilities and gender. By putting gender and mid-term exam grades into the regression, participants have an average of 2.161 percent points higher than non-participants. Also, male students benefit more from tutoring.